One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,6)(4,7)(5,8)(9,10)(11,13)(12,14)(15,16)(18,22)(20,23)(24,29)(25,30)(26,32)(28,31) involution — undirected(1,3,5,4)(2,6,8,7)(9,10)(11,15)(12,14)(13,16)(17,18,23,30,21,25,20,22)(19,26,31,29,27,24,28,32)(1,3,5,4)(2,7,8,6)(9,11,12,16)(10,13,14,15)(17,19,21,27)(18,24,25,26)(20,28,23,31)(22,29,30,32)(1,4,5,3)(2,7,8,6)(11,16)(13,15)(18,22)(19,27)(20,23)(24,32)(25,30)(26,29)(10,14)(13,15)(18,25)(19,27)(22,30)(28,31) involution — undirectedA Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.